We stayed at Tiffany's Sukhumvit's condo for 6 nights and enjoyed every moment of it. When you have anything to ask her she'll answer as soon as possible. She's helpful, always wanting to please. There is everything that you need in the condo to make yourself feel at home. It is located 10-15 minutes by foot to a BTS, but there are also plenty of taxis and tuk tuk that'll get you around in the city. As for food, there are plenty of local markets in the area. I would definetely consider staying here again when I come back to Bangkok